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Microsoft Security Essentials is Microsoft's free anti-virus offering.It runs on Windows XP, Windows Vista and Windows 7, but not on Windows 8, which has a built-in AV component.

Microsoft Security Essentials is an antivirus software product, it is free for home and small business (up to 10 PCs) users, as long as you have a genuine copy of Windows you can install Microsoft Security Essentials. It runs on Windows XP, Windows Vista and Windows 7, but not on Windows 8, which has a built-in AV component windows-defender.